Improvement



UNITED STATES PATENT OFFICE.

HENRY F. SHAW, OF WEST ROXBURY, MASSACHSETTS.

iMPRovEMENT iN GIG-sAws.

Specification forming part of Letters Patent No. 4 [,539, dated February9, 1864.

To all whom t may concern: l

Be it known that I, HENRY F. SHAW, of West Roxbury, in the county ofNorfolk and State of Massachusetts, have invented a new and usefulImprovement in GigeSaws; and I do hereby declare that the following is afull, clear, and exact description of the construction and operation ofthe same, reference being had to the accompanying drawings, forniing apart of this specification, in which- Figure l is a side elevation; Fig.2, atransverse vertical section in the line of the saw through the topof the gate, the upper straining-slide, and the upper axle; and Fig. 3,a similar section through the bottom of the gate, the lowerstrainingslide, and the lower axle.

Like parts are indicated by the same letters in all the drawings.

The nature of my invention consists in revvolving the sash or gate (bywhich the saw is strained and carried up and down) on a fixed axisaround the saw, so that articles to be sawed, however long, may beturned without coming in contact with'any stationary post or upright;also, in combining with said revolving sash or gate a spring, by meansof which its weight is supported and nearly balanced, so that thebearing-points may be relieved of unnecessary friction.

To enable others skilled in the art to make rand use my invention, Iwill now describe its construction and operation.

A represents the floor of a room, and .B the ceiling; or A and B may bethe top and bottom of a foursided frame.

C is a stand, of cast-iron or other suitable material, which may beconfined to the floor in the desired position by means of' bolts orscrews. The upper portion of D, as shown in Fig. l, is round, formingthe lower axle of the gate I.

E is a cap fast to the top of the axle D, and

F is the round sawing table resting ou the top of said cap. G s apendent stand or stud, the upper end of which is fast to the ceiling orframe B, the lower portion, H, being round and forming the upper axle ofthe gate. The axle H should be directly over the axle D.

The sash or gate is made of wood, and consists of the four pieces I I II, confined together in any suitable manner. Through the center of thehorizontal pieces of the gate are round holes of the proper diameter toreceive the axles H and D, m m (shown in dotted lines) being metallicrings or bearings bedded in the wood around said holes to sustain thefriction on the axles H and D.

J is the lower strainer-slide, a side view of which is shown in Fig. 3.which plays in a vertical slot, d, in the axle D. Around the center ofthis slide, between two shoulders, (see Fig. 3,) turns the sash I.Motion is communicated to this slide J, and consequently to the sash I,by means of the pitman U, the upper end of which is connected with theslide by the pin b, and the lower end is connected by the'pin a to thecrank-Wheel T, which is actuated by the pulley S, belt R, and drum Q, orin any other obvious manner.

K is the upper strainer-slide, which plays inthe groove g in the axle H.Justabove the center of this slide is a shoulder, n, (show n in the sideview, Fig. 2,) which rests upon the top of the upper piece of the sash..Thus it will be seen that the saw L is strained between the top andbottom pieces of the sash, while at the same time the latter is free torevolve around the former, and that the strain does not come on anybearing or wearing points.

More or less tension may be given to the saw L in the usual manner-t'.c., by means of a screw passing down through the top of slide K andresting on l[he top of I.

N is a long `dat spring, of Wood or metal, the free end of which isconnected with the top of slide K by means ofthe rope or wire P, for thepurpose described.

Havingthusdescribed the construction and operation of my improvement,what I claim as new, and desire to secure by Letters Patent, 1s-

l. Revolving the sash or gate, by which the saw is strained and carriedup and down on a xed axis around the saw, so that stock, however long,may be turned, substantially as described.

2. In combination with said revolving gate or sash, the employment of aspring, N, substantially as set forth, and for the purpose described.

HENRY F. SHAW.

Witnesses:

N. AMEs, N. Evans, Jr.

